Some help from upstream:
"The log message indicates that either the interface 'br0' does not exist on
your node (i.e. the node has not yet been configured with a bridge named 'br0'
as it's primary interface), or that libvirt/kvm is unable to attach the tap
device that KVM creates upon VM start to that bridge (this can sometimes be
caused by apparmor getting in the way). I believe the right tactic is to first
check for bridge existence, then start inspecting apparmor/libvirt/kvm issues."
** Changed in: eucalyptus (Ubuntu)
Assignee: (unassigned) => Thierry Carrez (ttx)
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[1.6.2] Fails to boot an instance: Failed to add tap interface to bridge 'br0'
https://bugs.launchpad.net/bugs/499491
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